Fuse



R. B. HA'VEY Aug. 16, 1932.

FUS E Filed Jan. 16, 1951 Izvenar: @o7/He 5. HQI/5y) Patented Anais, 1932 PATENT OFFICE RICHARD B. HAVEY, F BEECHVIE'W, PENNSYLVANIA FUSE Application led January 18, 1931. Serial No. 509,154.

This invention relates to fuses and, while not limited thereto, relates more particularly to cartridge fuses of the refillable type and has for one of its objects the provision of a novel form of fuse having means for forcibly i jaws. i

A further object is to provide a fuse structure which is simple in construction, cheap to manufacture, and safe in operation. In the drawing:

Figure 1 is a sectional plan view of a fuse constructed in accordance with` this inven-` tion. v j l Figure 2 is a transverse sectional elevatio taken on the line II-JII of Figure 1.

Figure 3 is a similar view taken on the line 111.111 of Figure 1.

Referring more particularly to the drawln the letter A designates the` fuse link ho der as a. whole which maybe of any desirable construction but is shown as composed of a tubular fiber body 2 having a portion cut away, as at 3, to permit ready access to the fuse link 4. l The ends of the body 2 are closed by copper or other metal disks 5 which are slotted to receive the contact tongues 6 which project therethrou h. The tongues 6 are preferably soldere or otherwise secured to the disks 5.

The inner ends of the tongues 6 are Ladapted to receive lthe ends of the fuse link 4 which are secured thereto by screws 7 The outer projecting ends of the tongues 6 are adapted to project materially beyond the fuse casing B and to be engaged between the fuse clips or contact fingers Y of a fuse holder of standard design (not shown).

The casing B is composed of a main tubular body 8 of insulating material, such as fiber, which is provided at each end with a metal collar 9. The collars 9 are preferably threaded on the ends of the casing body 8 and locked in position by rivets 10 although other well known means for securing the collars in position may be used.,

The collars are provided with an external threaded portion 12 to receive a sleeve-like head 14. The head 14 is provided adjacent vits innerlend with a. bore 15 and 'is enlarged at its inner end and threaded to form a threaded flange 15a whichlis screwed on the external portion 12 of the collar 9. Jaw-y carrying plates 16 are mounted in the bore 15 on achside of the tongue 6 and are free to move in a direction parallel to the longitudinal axis of the fuse.

AThe head 14 is slotted for al portion of its length, as at 17 to permit the passage of the contact clips or fingers Y of the fuse holder when the fuse is mounted in position.

The bore of the head 14 is reduced beyond the bore 15to provide a shoulder 18 to limit the movement of the plates 16 and is tapered adjacent its outer end to form wedgng portions 20. 1

The plates`16 are provided with leaf spring jaw holders 21 which are riveted thereto, as at 22, and carry jaws 230m their outer ends. The jaws 23 are preferably slotted to receive the springs 21 and rivets 24 are provided to prevent displacement of the jaws.

The outer faces of the jaws which contact with the tapered bore of the head 14 are tapered reversely to the head and the inner faces which extend parallel with the tongue contacts 6 are'flat.

The leaf springs 21 are normally tensioned outwardly toward the head 14 so as to maintain the jaws in contact with the tapered bore of the head.

The'external threadedportions 12 of the collars 9 are opposite hand so that the rotation of the casing B will simultaneously move the heads 14 at the opposite ends of the fuse toward or away from the casing. 0

In operation, after the fuse is mounted 1n the fuse holder with its tongue contacts 6 engaged between the contact clips or fingers of the fuse holder the casing body 8 will be rotated to screw. it into the heads 14, that is, the heads will be forced to move down on the body 8 relative to the plates 16l and jaws 23, thereby forcing the tapered bore or wedging portions against the jaws 23 andl causlng said jaws to move in against the clips or finger contacts of the fuse holder to clamp or force said contacts into tight engagement with the tongue contacts 6.

By clamping the clips or finger contacts of the fuse holder and the contact tongues 6 together the fuse is securely locked in position and perfect contact is made between the parts which permits the fuse to carry its extreme peak load without heating or burning of the contacts, arcing, or any of the other evils commonly resulting from loose or imperfect contacts.

While I have shown my invention as applied to a particular form of refillable fuse it will be understood that I do not wish to be limited thereto, since various modifications may be made to adapt the invention to any well known form of cartridge fuse without departing from the scope of my invention, as defined in the appended claims.

I claim:

. 1. A fuse comprising a tubular casing, a

fuse link holder mounted in said casing,

tongue contact members mounted in said fuse A link holder and projecting outwardly from leach end thereof, a sleeve-like head threaded on each end of said casing and having its internal bore tapered inwardly to form a wedging surface, said sleeve-like head being slotted to permit the contact fingers of a fuse holder to pass upwardly along said tongue contact members, clamping jaws mounted in said head, and means operable by the rotation of said casing for moving saidjaws along said tapered bore of said head to force said aws into clamping engagement with the contact fingers of the fuse holder.

2. A fuse comprising a tubular casing, a fuse link holder mounted in said casing, tongue contact members mounted in said fuse Alink holder and projecting outwardly from each end thereof, a sleeve-like head threaded on each end of said casing and having its internal bore tapered inwardly to form a wedging surface, said slee-likehead being slotted to permit the contact fingers of a fuse holder to pass upwardly along said tongue contact members, a jaw-carrying disk mounted in said head andmovable relative thereto, leaf spring members secured to said disk,

clamping jaw members secured to said springs, said disk being in engagement with the end of said casing and being adaptedto be moved longitudinally of said head when said casing is rotated to thread said head on and 0E of said casing, said'movement of said disk being adapted to move said jaws along said tapered bore of said head to thereby force said jaws into clamping engagement with the4 convtact fingers of the fuse holder. y

3. A fuse comprising a body portion, contact members at each end of said body adapted to be en a d by contact fingers of a fuse holder, an c ampmg means carried by said body independent of said contactmembers and adapted to be moved into lclamping engagement with the fingers of the fuse holder to orce said contact members and said fingers together.

4. A fuse comprising a tubular casing, a

ltongue contact member at each end of said casing adapted to be venga d between the contact fingers of a fuse hol er and clamping means carried by said casing independent of said ton e Contact members and adapted t0 be move into clamping engagement with the fingers of the fuse holder to force said fingers and said tongue contact members into intimate contact. j

5. A fuse comprising a tubular casing, a tongue contact member at each end of said casing adapted to be engaged between the contact fingers of a fuse holder and clamping means carried by said casing independent of said tongue contactV members and adapted to be moved into clamping engagement with the fingers of the fuse holder to force said fingers and said tongue contact members into intifuse link holder mounted in said casing,

tongue contact members mounted in said fuse link holder and projecting outwardly from each end thereof, a sleeve-like head on each end of said casing and having its internal bore tapered inwardly to form a wedging surface, said sleeve-like head being slotted to permit the contact fingers of a fuse holder to pass upwardly along said tongue contact members, clamping jaws mounted in said head, and means operable b the rotation of said casing formoving sai aws alon said tapered bore of said head to force sai jaws into clamping engagement with the contact fingers of the fuse holder.

7. In a fuse having a contact member at each end, a pair of clamping jaws carried by said fuse at each end thereof independent of said contact members and movable toward and away from said contact members.

In testimony whereof, I have hereunto set lllI 

